- greater than brass
- less than brass
- equal to brass
a) 35 m
B) 70 m
C) 140 m
D) 57.5 m
What do you understand by the following terms :Cubical expansion
Two rods of length and are made of materials whose coefficients of linear expansion are and . If at a certain change in temperature, the change in length of the rods are the same, what is the ratio of the original lengths of the rods?
Cannot be determined
Two identical copper rods, one hollow and the other solid are heated to the same rise in temperature. Will the two rods expand equally or unequally?
Two identical rods - one hollow and the other solid, are heated to the same rise in temperature. Which will expand more?
Two iron rods - one 10 m long and the other 5 m long, are heated to the same rise in temperature. Which will expand more?
- linear expansion
- superficial expansion
- cubical expansion
- material expansion
State three factors on which depend the linear expansion of a metal rod on heating.
One rod of copper and another identical rod of iron are heated to the same rise in temperature. Which rod will expand more? Give reason.
Two identical rods of copper is heated to different temperatures - one by 5∘C and the other by 10∘C. Which rod will expand more?
Equal lengths of different solids expand by equal amounts when heated equally.
What is the unit of linear expansion coefficient of a solid? Which expands more, iron or brass?
Sagging of telephone wires during summer is due to thermal expansion.
A metallic washer of internal diameter 5 cm is heated by 500 ∘C. If the coefficient of linear expansion of metal is 1.8 × 10−5 per ∘C, then the final diameter will be 5.045
While making tea or something on a gas stove in a metal beaker . Why don't the metal beaker don't expand because of heat?
- Have no bending
- Bend towards the metal with higher thermal expansion coefficient
- Bend towards the metal with lower thermal expansion coefficient
- Twist itself into a helix
- None of these
- Aluminium expands more on heating than brass
- Aluminium expands lesser than brass on heating
- Brass shrinks on heating
An iron ring is heated uniformly. Which of the following will be affected?
None of these
- 39.0 mm
- 3.9 mm
- 0.70 mm
- 1.95 mm
Small gaps are left between railway lines because
We cannot have rails of very long length.
It allows for expansion of rails during summer.
It allows for contraction of rails during summer.
Both (ii) and (iii).
- Due to thermal expansion
- Due to low pressure
- Due to moisture
- Due to dry climate